Journal of Strength and Conditioning Research最新文献

{"title":"Accuracy of Three Field-Based Devices for Measuring Counter Movement Jump Performance in Elite Female Volleyball Players.","authors":"Will C Wright, Michael V Fedewa, Elroy J Aguiar, Lee J Winchester, Randall E Schumacker, Michael R Esco","doi":"10.1519/JSC.0000000000005245","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005245","url":null,"abstract":"<p><strong>Abstract: </strong>Wright, WC, Fedewa, MV, Aguiar, EJ, Winchester, LJ, Schumacker, RE, and Esco, MR. Accuracy of three field-based devices for measuring counter movement jump performance in elite female volleyball players. J Strength Cond Res XX(X): 000-000, 2025-The purpose of this study was to determine the accuracy of 3 field-based methods for assessing countermovement jump (CMJ) performance in elite female volleyball players, using force plate (FP) data as the criterion standard. Sixteen collegiate female volleyball players (age = 19.4 ± 1.5 years, height = 176.2 ± 10.6 cm, body mass = 71.5 ± 11.1 kg) performed the CMJ while being simultaneously measured by a jump-and-reach device (JR), linear position transducer (LPT), mobile phone application (APP), and a criterion FP system. CMJ height from the FP (36.16 ± 3.88 cm) was significantly lower than the JR (39.53 ± 5.18 cm, p < 0.01) and LPT (48.23 ± 4.44 cm, p < 0.01) but slightly higher than the APP (35.32 ± 3.75 cm, p < 0.01). In addition, the APP displayed the strongest correlation (r = 0.99, p < 0.01) and smallest standard error of estimate (SEE ±0.27 cm) and 95% limits of agreement (±0.57 cm) compared with the other 2 devices. For CMJ, the mean power from the FP (2,243.00 ± 458.03 W) was significantly different from JR (2,615.69 ± 798.03 W, p = 0.02) and APP (1,354.31 ± 241.98 W, p < 0.01), but not the LPT (2,447.08 ± 559.32 W, p = 0.40). Although the correlations for mean power (r = 0.61-0.76) between the field devices and criterion were significant (p < 0.05), the SEE's (range ±310.90 to ±377.09 W) and limits of agreement (range ±655.28 to ±1,064.08 W) were considerably large. Based on the results, the APP seems to provide the most valid CMJ height measures. However, the caution should be used for assessing CMJ mean power with the field tools.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Association Between Measures of Maximal and Rapid Force Production With Rowing Ergometer Performance in Adolescent Male Rowers.","authors":"Steven House, Alex Wolf, Anthony Turner, Chris Bishop","doi":"10.1519/JSC.0000000000005218","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005218","url":null,"abstract":"","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationships Between Physical Activity, General Health and Fitness, and Job-Specific Fitness in Law Enforcement Officers.","authors":"Robert G Lockie, Maria M Beitzel, David A Alvarez, Kristine J Sanchez, Robin M Orr, J Jay Dawes, Joseph M Dulla","doi":"10.1519/JSC.0000000000005244","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005244","url":null,"abstract":"<p><strong>Abstract: </strong>Lockie, RG, Beitzel, MM, Alvarez, DA, Sanchez, KJ, Orr, RM, Dawes, JJ, and Dulla, JM. Relationships between physical activity, general health and fitness, and job-specific fitness in law enforcement officers. J Strength Cond Res XX(X): 000-000, 2025-Sedentary behaviors contribute to police officer fitness declines during their career, which may affect job performance. Physical activity (PA) could benefit general and job-specific fitness. This study derived relationships between PA and general and job-specific fitness in 60 officers (48 men, 12 women) from 1 law enforcement agency. Officers completed a questionnaire assessing PA (weekly strenuous, moderate, mild exercise sessions; activity score) and resistance training (RT) (resistance training frequency [RTF]; weekly sessions for 3 months [RT3M]; sessions in past 7 days [RT7D]). General fitness measures included resting heart rate (RHR), blood pressure, body composition, waist-to-hip ratio (WHR), sit-and-reach, grip strength, push-ups, sit-ups, and the YMCA step test. Job-specific fitness tests included an obstacle course, body drag, climbing tasks, and 500-yard run. Partial correlations controlling for sex calculated relationships between PA and RT with general and job-specific fitness. The sample was quartile split using activity score and examined by univariate analyses. Strenuous PA sessions related to RHR, WHR, push-ups, and sit-ups; activity score related to RHR and sit-ups (r = ±0.27-0.36). Resistance training frequency related to RHR, WHR, push-ups, and sit-ups; RT3M related to RHR, push-ups, and sit-ups; RT7D related to push-ups and sit-ups (r = ±0.31-0.43). The top quartile had a lower RHR than the bottom quartile and greater sit-ups than the bottom 2 quartiles (p ≤ 0.03). There were no significant results for PA and job-specific fitness. Strenuous PA related to lower RHR and WHR, and better muscular endurance. Resistance training frequency related to lower RHR and better muscular endurance. General PA may not be sufficient for training job-specific fitness.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effects of Accentuated Eccentric Loading Repetition Structures on Muscle Strength and Adaptation.","authors":"Caizheng Yue, Wenlei Xiong, Chenyu Zhang, Ruoxian Zhang, Keli Deng, Zhao Li","doi":"10.1519/JSC.0000000000005232","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005232","url":null,"abstract":"<p><strong>Abstract: </strong>Yue, C, Xiong, W, Zhang, C, Zhang, R, Deng, K, and Li, Z. The effects of accentuated eccentric loading repetition structures on muscle strength and adaptation. J Strength Cond Res XX(X): 000-000, 2025-The investigators aimed to compare the effects of different accentuated eccentric loading (AEL) repetition structures on lower limb muscle strength and adaptation. Thirty-five subjects were assigned to 3 groups: AEL6 group (120%/75% 1 repetition maximum (1RM), eccentric overload in every repetition, n = 11), AEL2 group (120%/75% 1RM, eccentric overload only on the first and fourth repetitions, 75%/75% 1RM on others, n = 12), and TL group (75%/75% 1RM, traditional loading, n = 12). All groups performed 6 repetitions × 4 sets, twice per week for 8 weeks. All groups showed statistically significant improvements in rectus femoris cross-sectional area (RFCSA), countermovement jump height (CMJH), countermovement jump relative peak propulsive power (RPP), back squat 1RM, eccentric peak torque (PT), and integrated electromyography (iEMG) (p < 0.01), with significant group × time interactions for all variables (p < 0.01). AEL6 showed statistically greater improvements than TL across all variables. In addition, AEL6 showed statistically greater improvements in RFCSA, 1RM, PT, and iEMG compared with AEL2 (p < 0.05-0.01), but no significant differences were observed in CMJH and RPP (p > 0.05). AEL2 had statistically greater improvements in CMJH, RPP, PT, and iEMG than TL (p < 0.05-0.01), with no significant differences in RFCSA and 1RM (p > 0.05). Therefore, we conclude that AEL is a more effective programming tactic for improving muscle strength and adaptation, whereas AEL2 appears to have a better dose-response effect for improving jump performance.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Impact of Team Practice Block Start Times on Sleep Characteristics in Collegiate Athletes.","authors":"Emaly Vatne, Matthew Vatne, Daniel Cencer, Catherine Saenz, William J Kraemer, Bradley Robinson, Paul Jones, Jason Stone, Justin Merrigan, Tyler Carpenter, Joshua Hagen","doi":"10.1519/JSC.0000000000005206","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005206","url":null,"abstract":"<p><strong>Abstract: </strong>Vatne, E, Vatne, M, Cencer, D, Saenz, C, Kraemer, WJ, Robinson, B, Jones, P, Stone, J, Merrigan, J, Carpenter, T, and Hagen, J. The impact of team practice block start times on sleep characteristics in collegiate athletes. J Strength Cond Res XX(X): 000-000, 2025-Optimal sleep is crucial for health and performance, yet collegiate athletes often face training schedules that disrupt sleep. This study aimed to examine how practice block start times relate to objective measures of sleep quantity and quality among collegiate athletes. After filtering for compliance and data quality, 27,576 nighttime sleep records (Ōura Health, Oulu, Finland) were included from 359 athletes (N = 178 female; N = 181 male) across 15 varsity teams, with football being the most represented. Sleep was tracked using a validated wearable device (Ōura Health, Oulu, Finland). Practice blocks were categorized by start times: \"Early Morning\" (≤8 am), \"Morning\" (after 8 am to before 12 pm), and \"Afternoon\" (12-4 pm). Data were assessed for normality, followed by a 3 (practice block) X 2 (biological sex) ANOVA or Kruskal-Wallis test. Pairwise comparisons revealed that total sleep time (p < 0.05) and sleep onset latency (p < 0.05) were significantly impaired in the early morning compared with morning groups for male and female athletes. Time in bed was significantly reduced (p < 0.05) for female athletes and sleep efficiency was significantly reduced (p < 0.001) for male athletes in the early morning group compared with morning. Earlier practice start times reduce sleep quality and quantity, highlighting the need for careful consideration when designing training plans. If coaches are unable to avoid early morning practices, educational initiatives focused on individualized strategies to enhance sleep may help mitigate deleterious effects of early morning practices on sleep quality and quantity.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effects of a Semester of Preprofessional Dance Training on Biomarkers and Performance Variables in Elite Adolescent Ballet Dancers.","authors":"David J Sanders, Morgan S Murray, Bridget A McFadden, Alexa J Chandler, Alan J Walker, Brittany N Bozzini, Harry P Cintineo, Marissa L Bello, Michelle A Arent, Shawn M Arent","doi":"10.1519/JSC.0000000000005219","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005219","url":null,"abstract":"<p><strong>Abstract: </strong>Sanders, DJ, Murray, MS, McFadden, BA, Chandler, AJ, Walker, AJ, Bozzini, BN, Cintineo, HP, Bello, ML, Arent, MA, and Arent, SM. The effects of a semester of preprofessional dance training on biomarkers and performance variables in elite adolescent ballet dancers. J Strength Cond Res XX(X): 000-000, 2025-Early sport specialization exposes young athletes to high volumes of training. More knowledge is needed regarding the physiologic changes that may occur, particularly identifying differences between sexes. The purpose of this study was to evaluate biomarkers and performance changes in elite, preprofessional ballet dancers from the same training program. Male (N = 10) and female (N = 13) dancers participated in blood draws at the beginning of their semester (T1) and every 4 weeks thereafter (T2-T5). Performance was assessed pre- and postsemester (e.g., body composition, vertical jump, and V̇o2max). Repeated measures multivariate analysis of variance assessed performance and biomarker responses throughout the semester (p < 0.05). Sex-by-time interactions were observed for sex-hormone binding globulin, free cortisol, follicle stimulating hormone, and omega 6:3 ratio (p < 0.05). Sex effects were found in free triiodothyronine, testosterone, estradiol, growth hormone, creatine kinase (CK), percentage transferrin saturation, ferritin, and all performance tests (p < 0.05). Female dancers experienced further time effects in free thyroxine, follicle stimulating hormone, tumor necrosis factor alpha, omega 6:3 ratio, iron, percentage transferrin saturation, and ferritin (p < 0.05). Male dancers experienced further time effects in total triiodothyronine, total and free cortisol, CK, tumor necrosis factor alpha, vitamin D, percentage transferrin saturation, and ferritin (p < 0.05). Despite similar training, differential responses were observed between male and female dancers, particularly with regard to cortisol and hematologic markers. Adequate monitoring programs can help identify sex differences in response to training demands. Performance staff should account for and address these sex differences to enhance recovery outcomes.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of an American Football Practice on Physical and Cognitive Performance and Recovery.","authors":"Eyal Frank, Tavor Ben-Zeev, Inbal Weissman, Lior Binman, Ishay Ostfeld, Noa Harel, Jay R Hoffman","doi":"10.1519/JSC.0000000000005214","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005214","url":null,"abstract":"<p><strong>Abstract: </strong>Frank, E, Ben-Zeev, T, Weissman, I, Binman, L, Ostfeld, I, Harel, N, and Hoffman, JR. The effect of an American football practice on physical and cognitive performance and recovery. J Strength Cond Res XX(X): 000-000, 2025-This study examined the effects of the first full-contact American football practice on cognitive and physical performance and recovery during a 36-hour period. Twelve male athletes from the Israeli Football League volunteered to participate in a study representing the initial full-contact football practice. Cognitive performance was assessed using the Sports Concussion Assessment Tool Fifth Edition and Stroop tests. Physical performance assessments included the isometric mid-thigh pull, vertical jump power, and reactive agility. Assessments occurred before practice (PRE), immediately postpractice (IP), 24 hours postpractice (D1), and 36 hours postpractice (D2). Blood samples were obtained to assess myoglobin, and brain-derived neurotrophic factor (BDNF), testosterone (T), and cortisol (C). T and C measures were obtained at PRE only to provide an indication of the baseline anabolic/catabolic ratio on the recovery response. Results revealed that physical performance measures, including peak force and rate of force development (RFD), showed significant declines IP, and remained impaired at D2. In contrast, cognitive function demonstrated improvements over time, with significant increases in acute memory, concentration, and delayed memory at D2. The testosterone-to-cortisol ratio was correlated (r = 0.704, p = 0.034) with changes in RFDmax, Myoglobin concentrations were significantly elevated at IP, reflecting the muscle damaging effects of the practice. No changes were observed in BDNF concentrations. These findings indicate that the initial full-contact football practice induces neuromuscular impairments for at least 36 hours. However, cognitive performance demonstrated a different recovery trajectory, improving over time. Understanding these recovery patterns may provide insight into optimizing training load management and recovery strategies during initial football training.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Examining Agreement Between Coach Prescribed and Observed Training Loads With Those That Are Reported by Professional Female Soccer Players.","authors":"Kieran Wilmot, Antonio Dello Iacono, Tom W Macpherson","doi":"10.1519/JSC.0000000000005241","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005241","url":null,"abstract":"<p><strong>Abstract: </strong>Wilmot, K, Dello Iacono, A, and Macpherson, TW. Examining agreement between coach prescribed and observed training loads with those that are reported by professional female soccer players. J Strength Cond Res XX(X): 000-000, 2025-There is no research exploring agreement of training load (TL) between players and coaches in female soccer, therefore, we examined agreement of perceived TL between professional female soccer players and their coaches. An observational research design was used with a professional women soccer team (3 coaches and 23 players), with data collected for an 8-week training period from a total of 20 training sessions. Internal TL was measured using differential ratings of perceived exertion (dRPE) on the original Borg CR-100 scale, with exertional scores taken for the overall ratings of perceived exertion, ratings of perceived exertion of breathlessness, ratings of perceived exertion on the legs, and technical ratings of perceived exertion. External TL was measured with PlayerData global positioning system units, worn during every training session, with total distance and high-intensity distance data selected for the study. Players and coaches were familiarized with dRPE and the CR-100 scale. Before training, coaches provided a training plan alongside prescribed dRPE and external load. After training, coach-observed dRPE and external load measures were collected alongside player-perceived dRPE. Two 1-sided tests assessed equivalence between coach (prescribed and observed) and player-perceived dRPE. Statistically significant equivalence was reported for agreement between coach (prescribed and observed) and player-perceived dRPE (p < 0.05). However, for both external TL measures, no statistical significance in agreement was reported between coaches and players. This study provides preliminary evidence of agreement between coach and player perceptions of TL in professional woman's soccer. This study provides a key finding in professional woman's soccer, potentially allowing greater precision in TL prescription and achieving desired training outcomes.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing Collegiate Female Soccer Athlete Technical and Physical Performance Through Position-Specific Conditioning Training.","authors":"Minh N Q Nguyen, Andrew C Fry, Matthew J Garver, Drake A Eserhaut, Yang Yang, Derek A Crawford","doi":"10.1519/JSC.0000000000005230","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005230","url":null,"abstract":"<p><strong>Abstract: </strong>Nguyen, MNQ, Fry, AC, Garver, MJ, Eserhaut, DA, Yang, Y, and Crawford, DA. Optimizing collegiate female soccer athlete technical and physical performance through position-specific conditioning training. J Strength Cond Res XX(X): 000-000, 2025-Position-specific conditioning training (PSCT), which addresses the distinct physical and technical demands of soccer positions, has emerged as a promising training methodology. The aim of this study was to examine the effects of PSCT on the physical and technical performance of collegiate female soccer players. Eighteen National Collegiate Athletic Association (NCAA) Division II female soccer athletes (height = 169 ± 5.2 cm; body mass = 64.3 ± 7.2 kg; age = 20.1 ± 0.9 years) participated in a controlled, two-phase, two-group crossover study spanning 5 weeks of training per phase. Performance assessment included the Yo-Yo Intermittent Recovery Test Level 1 (YYIRT1), sprint speed, repeated sprint ability, Agility T-test, and Loughborough Soccer Passing Test (LSPT) under nonfatigue and fatigued conditions. Training load (TL) was monitored using the session rating of perceived exertion (sRPE). The design of the PSCT program encompassed 4 high-intensity drills for attackers and defenders. Each drill targeted an intensity of 90-95% heart rate maximum for 4-minute work bouts, interspersed with 4-minute active recovery periods. Normal conditioning methods served as the control. Postintervention, significant improvements were observed in the YYIRT1 endurance test for both groups (μ = 22.75%, p < 0.05). However, a significant improvement was observed only in the PSCT group for LSPT under nonfatigued and fatigued conditions (μ = 13.1%, p < 0.05 and μ = 15.5%, p < 0.05, respectively). PSCT showed no significant impact on sRPE or other physical performance metrics. The study confirmed that PSCT is an effective conditioning modality for enhancing skills and endurance without increasing the TL for NCAA female soccer athletes, fostering a well-rounded approach to player development.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the Use of Jump Assessments for Firefighters in the London Fire Brigade.","authors":"Lee Brown, Kim Hastings, Scott Caufield, Joseph Haynes, Paul McClenaghan, Seth Lenetsky","doi":"10.1519/JSC.0000000000005229","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005229","url":null,"abstract":"<p><strong>Abstract: </strong>Brown, L, Hastings, K, Caufield, S, Haynes, J, McClenaghan, P, and Lenetsky, S. Investigating the use of jump assessments for firefighters in the London Fire Brigade. J Strength Cond Res XX(X): 000-000, 2025-Firefighters must possess requisite muscular strength, power, and endurance to perform operational tasks while handling external loads, such as door breakers and hose lines. When firefighters from the London Fire Brigade (LFB) pass the academy, they are assessed annually using either the Chester Walk Treadmill Test, 1.5-mile, or the bleep test. No strength or power assessments are regularly performed. Therefore, the primary purpose of this study was to identify the feasibility of introducing jump testing for strength and power assessments to be used in the annual fitness test. A total of 41 men (n = 38) and women (n = 3) were recruited (age: 38 ± 9 years; stature: 1.8 ± 0.04 m; mass: 86 ± 10.6), with a minimum of 1-year service. The squat jump (SJ), countermovement jump (CMJ), reactive strength index, and the 1.5-mile treadmill test were used to assess the subjects. Analysis revealed an inverse relationship between SJ, CMJ, and the treadmill run test, indicating that increased jump performance was related to faster run times, with a very large effect size. This study demonstrated that jump tests can be used as an additive to the graded treadmill walking-based test currently being used for annual fitness testing by the LFB.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}